8491393 has 4 divisors (see below), whose sum is σ = 8860608. Its totient is φ = 8122180.

The previous prime is 8491391. The next prime is 8491409. The reversal of 8491393 is 3931948.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8491393 - 2¹ = 8491391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8491391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184573 + ... + 184618.

It is an arithmetic number, because the mean of its divisors is an integer number (2215152).

Almost surely, 2^8491393 is an apocalyptic number.

It is an amenable number.

8491393 is a deficient number, since it is larger than the sum of its proper divisors (369215).

8491393 is a wasteful number, since it uses less digits than its factorization.

8491393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369214.

The product of its digits is 23328, while the sum is 37.

The square root of 8491393 is about 2913.9994852436. Note that the first 3 decimals coincide. The cubic root of 8491393 is about 204.0138479001.

It can be divided in two parts, 8 and 491393, that added together give a square (491401 = 701²).

The spelling of 8491393 in words is "eight million, four hundred ninety-one thousand, three hundred ninety-three".